use clap::Parser;
use rhai_dispatcher::{RhaiDispatcher, RhaiDispatcherBuilder};
use log::{error, info};
use std::io::{self, Write};
use std::time::Duration;

#[derive(Parser, Debug)]
#[command(author, version, about = "Circles Client - Rhai script execution client", long_about = None)]
struct Args {
    /// Caller public key (caller ID)
    #[arg(short = 'c', long = "caller-key", help = "Caller public key (your identity)")]
    caller_public_key: String,

    /// Circle public key (context ID)
    #[arg(short = 'k', long = "circle-key", help = "Circle public key (execution context)")]
    circle_public_key: String,

    /// Worker public key (defaults to circle public key if not provided)
    #[arg(short = 'w', long = "worker-key", help = "Worker public key (defaults to circle key)")]
    worker_public_key: Option<String>,

    /// Redis URL
    #[arg(short, long, default_value = "redis://localhost:6379", help = "Redis connection URL")]
    redis_url: String,

    /// Rhai script to execute
    #[arg(short, long, help = "Rhai script to execute")]
    script: Option<String>,

    /// Path to Rhai script file
    #[arg(short, long, help = "Path to Rhai script file")]
    file: Option<String>,

    /// Timeout for script execution (in seconds)
    #[arg(short, long, default_value = "30", help = "Timeout for script execution in seconds")]
    timeout: u64,

    /// Increase verbosity (can be used multiple times)
    #[arg(short, long, action = clap::ArgAction::Count, help = "Increase verbosity (-v for debug, -vv for trace)")]
    verbose: u8,
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let args = Args::parse();

    // Configure logging based on verbosity level
    let log_config = match args.verbose {
        0 => "warn,circles_client=info,rhai_dispatcher=info",
        1 => "info,circles_client=debug,rhai_dispatcher=debug",
        2 => "debug",
        _ => "trace",
    };
    
    std::env::set_var("RUST_LOG", log_config);
    env_logger::init();

    // Use worker key or default to circle key
    let worker_key = args.worker_public_key.unwrap_or_else(|| args.circle_public_key.clone());

    info!("🔗 Starting Circles Client");
    info!("📋 Configuration:");
    info!("   Caller Key: {}", args.caller_public_key);
    info!("   Circle Key: {}", args.circle_public_key);
    info!("   Worker Key: {}", worker_key);
    info!("   Redis URL: {}", args.redis_url);
    info!("   Timeout: {}s", args.timeout);
    info!();

    // Create the Rhai client
    let client = RhaiDispatcherBuilder::new()
        .caller_id(&args.caller_public_key)
        .redis_url(&args.redis_url)
        .build()?;

    info!("✅ Connected to Redis at {}", args.redis_url);

    // Determine execution mode
    if let Some(script_content) = args.script {
        // Execute inline script
        info!("📜 Executing inline script");
        execute_script(&client, &worker_key, script_content, args.timeout).await?;
    } else if let Some(file_path) = args.file {
        // Execute script from file
        info!("📁 Loading script from file: {}", file_path);
        let script_content = std::fs::read_to_string(&file_path)
            .map_err(|e| format!("Failed to read script file '{}': {}", file_path, e))?;
        execute_script(&client, &worker_key, script_content, args.timeout).await?;
    } else {
        // Interactive mode
        info!("🎮 Entering interactive mode");
        info!("Type Rhai scripts and press Enter to execute. Type 'exit' or 'quit' to close.");
        run_interactive_mode(&client, &worker_key, args.timeout).await?;
    }

    Ok(())
}

async fn execute_script(
    client: &RhaiDispatcher,
    worker_key: &str,
    script: String,
    timeout_secs: u64,
) -> Result<(), Box<dyn std::error::Error>> {
    info!("⚡ Executing script: {:.50}...", script);
    
    let timeout = Duration::from_secs(timeout_secs);
    
    match client
        .new_play_request()
        .recipient_id(worker_key)
        .script(&script)
        .timeout(timeout)
        .await_response()
        .await
    {
        Ok(result) => {
            info!("✅ Script execution completed");
            println!("Status: {}", result.status);
            if let Some(output) = result.output {
                println!("Output: {}", output);
            }
            if let Some(error) = result.error {
                println!("Error: {}", error);
            }
        }
        Err(e) => {
            error!("❌ Script execution failed: {}", e);
            return Err(Box::new(e));
        }
    }
    
    Ok(())
}

async fn run_interactive_mode(
    client: &RhaiDispatcher,
    worker_key: &str,
    timeout_secs: u64,
) -> Result<(), Box<dyn std::error::Error>> {
    let timeout = Duration::from_secs(timeout_secs);
    
    loop {
        print!("rhai> ");
        io::stdout().flush()?;
        
        let mut input = String::new();
        io::stdin().read_line(&mut input)?;
        
        let input = input.trim();
        
        if input.is_empty() {
            continue;
        }
        
        if input == "exit" || input == "quit" {
            info!("👋 Goodbye!");
            break;
        }
        
        info!("⚡ Executing: {}", input);
        
        match client
            .new_play_request()
            .recipient_id(worker_key)
            .script(input)
            .timeout(timeout)
            .await_response()
            .await
        {
            Ok(result) => {
                println!("Status: {}", result.status);
                if let Some(output) = result.output {
                    println!("Output: {}", output);
                }
                if let Some(error) = result.error {
                    println!("Error: {}", error);
                }
            }
            Err(e) => {
                error!("❌ Execution failed: {}", e);
            }
        }
        
        println!(); // Add blank line for readability
    }
    
    Ok(())
}